Add big text for the numeric types section.

tabatkins · tabatkins · commit 8f88dcf6913b · 2017-06-06T13:17:36.000-07:00
diff --git a/css-typed-om/Overview.bs b/css-typed-om/Overview.bs
@@ -841,6 +841,16 @@ rather than on {{CSSNumericValue}} instances.
         and return the result.
 </div>
 
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 ### Numeric Value Typing ### {#numeric-typing}
 
 Each {{CSSNumericValue}} has an associated <dfn for=CSSNumericValue>type</dfn>,
